package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已登录
 */
@Slf4j
@WebFilter(filterName = "loginFilter",urlPatterns = "/*")
public class LoginFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取此次请求的URI
        String requestURI = request.getRequestURI(); //uri url
        log.info("拦截到请求: {}",requestURI);

        //登录相关的请求都放行
        // /backend/**
        // /front/**
        // /employee/login
        // /employee/logout

        // /backend/page/login/login.html
        // /backend/page/index.html
        // /backend/page/login.js

        String[] patterns =
                new String[]{
                        "/backend/**",
                        "/front/**",
                        "/employee/login",
                        "/employee/logout",
                        "/common/**",
                        "/user/login",
                        "/user/sendMsg",
                        "/doc.html",
                        "/webjars/**",
                        "/swagger-resources",
                        "/v2/api-docs"
                };
        //String[] patterns = urlPatterns.split(",");

        // 路径匹配，检查本次请求是否需要放行
        for (String pattern : patterns) {
            boolean match = PATH_MATCHER.match(pattern, requestURI);
            if(match){
                chain.doFilter(request, response);
                return;
            }
        }
        //判断用户是否登录,如果登录过了,放行
        // 判断的依据
        Employee employee = (Employee) request.getSession().getAttribute("employee");
        if (employee != null) {
            //
            log.info("用户已登录，用户id为：{}", employee);
            BaseContext.setCurrentId(employee.getId());
            chain.doFilter(request, response);
            BaseContext.removeCurrentId();
            return;
        }

        // 判断登录状态，如果已登录，则直接放行
        Long userId = (Long) request.getSession().getAttribute("user");
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", userId);
            BaseContext.setCurrentId(userId);
            chain.doFilter(request, response);
            BaseContext.removeCurrentId();
            return;
        }
        log.info("用户未登录");

        //若没有登录,拦截
        // 返回数据 R :code 0 data 不需要 msg
        R r = R.error("NOTLOGIN");
        String jsonString = JSON.toJSONString(r);
        response.getWriter().write(jsonString);
    }
}

/*
@Slf4j
@WebFilter(filterName = "loginFilter", urlPatterns = "/*")
public class LoginFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();//backend/index.html

        log.info("拦截到请求：{}", requestURI);

        //登录相关的请求都放行
        // /backend/**
        // /front/**
        // /employee/login
        // /employee/logout

        // /backend/page/login/login.html
        // /backend/page/index.html
        // /backend/page/login.js

        //2.定义放行路径及资源
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //3.进行路径的匹配
        boolean check = check(urls, requestURI);

        //4.结果进行处理
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        //判断用户是否登录,如果登录过了,放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("employee"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            BaseContext.removethreadlocal();
            return;
        }

        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request, response);
            BaseContext.removethreadlocal();
            return;
        }
        log.info("用户未登录");

        // 返回数据 R :code 0 data 不需要 msg
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    // 路径匹配，检查本次请求是否需要放行
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
*/

